In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... 1992 Ian and Sylvia[?]
1993 Anne Murray
1994 Rush
1995 Buffy Sainte-Marie[?]
1996 David Clayton-Thomas[?]
1996 Denny Doherty[?]
1996 John Kay[?]
1996 ...